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Latest Dione Stories

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2009-03-17 10:50:00

On February 24, 2009, the NASA/ESA Hubble Space Telescope captured a photo sequence of four moons of Saturn passing in front of their parent planet. The moons, from far left to right, are the white icy moons Enceladus and Dione, the large orange moon Titan, and icy Mimas. Due to the angle of the Sun, they are each preceded by their own shadow. These rare moon transits only happen when the tilt of Saturn's ring plane is nearly "edge on" as seen from the Earth. Saturn's rings will be...

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2009-02-24 09:00:00

Something is about to happen on Saturn that's so pretty, even Hubble will pause to take a look. "On Feb. 24th, there's going to be a quadruple transit of Saturn's moons," says Keith Noll of the Hubble Space Telescope Science Institute. "Titan, Mimas, Dione and Enceladus will pass directly in front of Saturn and we'll see their silhouettes crossing Saturn's cloudtops"”all four at the same time." Hubble won't be the only one looking. Amateur astronomers will be able to see it, too. The...

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2008-04-15 10:30:00

NASA is extending the international Cassini-Huygens mission by two years. The historic spacecraft's stunning discoveries and images have revolutionized our knowledge of Saturn and its moons. Cassini's mission originally had been scheduled to end in July 2008. The newly-announced two-year extension will include 60 additional orbits of Saturn and more flybys of its exotic moons. These will include 26 flybys of Titan, seven of Enceladus, and one each of Dione, Rhea and Helene. The extension also...

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2008-03-16 12:30:00

One of Saturn's moons may have been home to a body of water, according to scientists who reported their findings at the 39th Lunar and Planetary Science Conference in Houston.With a density similar to pure ice, researchers think that Tethys underwent tidal heating, followed by cooling which could have been responsible for forming the Ithaca Chasma.Erinna Chen and Francis Nimmo, from the University of California, Santa Cruz, proposed that it was Tethys' orbital interaction with Dione, another...

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2008-02-19 12:05:00

Despite the incredible diversity of Saturn's icy moons, theirs is a story of great interaction. Some of them are pock-marked, some seemingly dirty, others pristine, one spongy, one two-faced, some still spewing with activity and some seeming to be captured from the far reaches of the solar system. Yet many of them have a common thread -- black "stuff" coating their surfaces. "We are beginning to unravel the mysteries of these different and strange moons," said Rosaly Lopes, Cassini scientist...

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2007-12-19 19:06:38

San Francisco -- Enceladus, the tiny satellite of Saturn, is colder than ice, but data gathered by the Cassini-Huygens Mission to Saturn and Titan has detected a hot spot that could mean there is life in the old moon after all. In fact, for researchers of the outer planets, Enceladus is so intellectually hot, it's smokin'. The heat being generated on the moon's south pole at a hot spot is enough to eject plumes of ice and vapor above Enceladus. These plumes, according to William B....

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2007-06-14 08:14:20

Saturn's moons Tethys and Dione are flinging great streams of particles into space, according to data from the NASA/ESA/ASI Cassini mission to Saturn. The discovery suggests the possibility of some sort of geological activity, perhaps even volcanic, on these icy worlds. The particles were traced to the two moons because of the dramatic movement of electrically charged gas in the magnetic environs of Saturn. Known as plasma, the gas is composed of negatively charged electrons and positively...

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2005-02-24 15:20:00

JPL -- NASA's Cassini spacecraft continues making new and exciting discoveries. New findings include wandering and rubble-pile moons; new and clumpy Saturn rings; splintering storms and a dynamic magnetosphere. "For the last seven months it has been a nonstop, science-packed mission. It has been a whirlwind, and already we have many new results," said Dr. Dennis Matson, Cassini project scientist at NASA's Jet Propulsion Laboratory, Pasadena, Calif. Weak, linear density waves caused in...

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2005-02-13 11:25:00

Many of Saturn's more interesting moons are crusted with ice. The moons are often too small for a radioactive core and internal heating. The bizarre wrinkled surface on one of the moons, Enceladus, may reveal a geologically young age. Astrobiology Magazine -- This Cassini image [right] of Saturn's moon Enceladus shows a region containing bizarre, wrinkled terrain. Enceladus is covered with bright water ice. The part of its surface visible here appears to be largely free of craters --...

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2005-01-20 07:10:00

PARIS (AFP) -- The US spacecraft Cassini ran into dramatic storms of dust as it hurtled towards its rendezvous with Saturn last year, a study says. The microscopic grains smashed into Cassini with an impact speed of more than 100 kilometers (62 miles) per second (360,000 kph, 225,000 mph) as the craft was ferrying the European probe Huygens towards Saturn last year. The dust probably came from the outermost ring of Saturn, called the A ring, the authors believe. Other possible sources were...


Latest Dione Reference Libraries

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2004-10-19 04:45:41

Saturn's moon Rhea -- Rhea is the second largest moon of Saturn. It was discovered in 1672 by Giovanni Cassini. Rhea is an icy body with a density of about 1.24 gm/cm3. This low density indicates that it has a rocky core taking up less than one-third of the moon's mass with the rest composed of water-ice. Rhea's features resemble those of Dione, with dissimilar leading and trailing hemispheres, suggesting similar composition and histories. The temperature on Rhea is -174°C in direct...

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2004-10-19 04:45:41

Saturn's moon Helene -- Helene is a moon of Saturn, discovered by Laques and Lecacheux in 1980 from ground-based observations. It is co-oribtal with Dione and located in its leading Lagrangian point (L4) and hence is sometimes referred to as "Dione B". ----- Orbital radius: 377,400 km Diameter: 33 km (36 x 32 x 30) Mass: Unknown Orbital period: 2.7369 days Orbital inclination: 0.2 ----- NASA Learn more on this topic from eLibrary here:

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2004-10-19 04:45:41

Saturn's moon Dione -- Dione is a moon of Saturn discovered by Giovanni Cassini in 1684. It is composed primarily of water ice, but as the densest of Saturn's moons (aside from Titan, whose density is increased by gravitational compression) it must have a considerable fraction of denser material like silicate rock in its interior. Though somewhat smaller, Dione is otherwise very similar to Rhea. They both have similar compositions, albedo features and varied terrain. Both have dissimilar...

Telesto (Saturn Moon)
2004-10-19 04:45:41

Telesto is a small Trojan moon of the sixth planet from the sun, Saturn. Telesto, which was discovered in 1980 by Smith, Reitsema, Larson and Fountain, is one of around 200 natural satellites in Saturnian orbit. It is one of only 62 moons that have a secure orbit, and only one of 53 named moons orbiting the ringed planet. Telesto was officially designated S/1980 S 13 and was officially named in 1983 after the Greek sea goddess of the same name. This moon is also designated as Saturn XIII...

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2004-10-19 04:45:41

Saturn's moon Tethys -- Tethys is a moon of Saturn that was discovered by Giovanni Cassini in 1684. Tethys is an icy body similar in nature to Dione and Rhea. The density of Tethys is 1.21 g/cm3, indicating that it is composed almost entirely of water-ice. Tethys's surface is heavily cratered and contains numerous cracks caused by faults in the ice. There are two different types of terrain found on Tethys, one composed of densely cratered regions and the other consisting of a dark...

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The word 'ambsace' comes from a Latin word meaning 'both'.